organetto
/ˌɔːɡəˈnɛtəʊ/Music
noun
1A small portable organ, popular from the 13th to the 16th cent., especially in Italy.
2A small diatonic accordion from Italy.
Origin
Late 19th century; earliest use found in John Stainer (1840–1901), musicologist and composer. From Italian organetto from organo + -etto.